Well tool



May 9,1944. H, Q T "2,348,563

Filed Aug. 2, 1940 2 Sheets-Sheet 1 Patented May 9, 1944 UNITED STATESPATENT OFFICE 17 Claims.

This invention relates to new and useful improvements in well tools.

One object of the invention is to provide an improved well tool which isarranged to be releasably connected with a well device, whereby saidtool may be utilized to run said device into a well bore or remove thesame therefrom, the tool being particularly adapted for use withremovable bottom hole chokes, regulators, valves, or other bottom holedevices.

An important object of the invention is to provide an improved runningtool having movable dogs or gripping elements which are adapted toengage the well device being run into the well, whereby the use of afrangible connection between the running tool and well device iseliminated; the arrangement of the dogs or elements preventing the welldevice from breaking loose during lowering and also obviating otherdisadvantages incidental to the use of a shear pin or rivet forconnecting the running tool and well device.

Another object of the invention is to provide an improved running toolwherein the dogs are normally and yieldably held in their engagedposition and wherein said dogs are adapted to be moved to a disengagedposition by an actuating member which is slidable relative to saidelements; the actuating member being normally restrained from movementby a releasable means which is so mounted that said means is notsubjected to the load carried by the tool, whereby danger of thereleasable means breaking or releasing during the lowering operation iseliminated.

Still another object of the invention is to provid an improved runningtool, of the character described, wherein the releasable means includesa frangible element which is fully enclosed within the tool, wherebywhen said element is broken, the pieces thereof cannot fall into thebore around the device being lowered by the tool to interfere with theremoval of said tool from the bore.

A further object of the invention is to provide an improved running toolhaving locking means for positively latching the gripping elements ofthe tool in an expanded or non-engaged position to assure disengagementof said tool fromthe well device which has been lowered by means of thetool.

A construction designed to carry out the invention will be hereinafterdescribed, together with other features of the invention.

The invention will be more readily understood sectional view of the toolin its engaged position,

Figure 3 is a similar view, with the dogs in their disengaged orreleased position,

Figure 4 is a horizontal, cross-sectional View,

taken on the line 4-4 of Figure 2,

Figure 5 is an enlarged, partial, transverse,

vertical, sectional view, taken on the line 5-5 of Figure 4, g

Figur 6 is a view,. similar to Figure 5, and taken on the line 6-6 ofFigure 4, Figures 7 to 10 are horizontal, cross-sectional vieWS, takenon the lines 1-- 8-8, 99 and l0lll, respectively, of Figure 2,.and

Figure 11 is a horizontal, cross-sectional view, I

taken on the line l 1-] I of Figure 5.

In the drawings, the numeral I0 designates a solid body or mandrel,which is substantially cylindrical in cross-section and which isprovided with an upstanding,-externally screw-threaded pin H at itsupper end. The pin is reduced in diameter relative to the externaldiameter of. the mandrel, whereby an external annular shoulder I2 iformed at the intersection of the body and the pin. An elongate sleeveI3 is preferably formed integral with the lower end of the mandrel orbody In and extends downwardly therefrom, said sleeve having an externaldiameter which is greater than the external diameter of said bodyormandrel. The sleeve I3 is provided with a pair ofdiametrically-opposed, vertical or longitudinal slots [4 which extendsubstantially throughout the length thereof. In addition, said sleevehas by-pass port l5 formed in its wall.

The lower portion of the mandrel above the upper end of the sleeve I3 isformed with a pair of diametrically-opposed recesses It, as is clearlyshown in Figures 2 and 3, and immediately above the recesses, themandrel is formed with a tapered portion Illa. The recesses are alinedvertically with the vertical slots I l within the sleeve l3. A pair ofelongate dogs or elements 18 are disposed diametrically opposite eachother and each dog is formed with an inwardly directed lug H whichprojects into the adjacent recess [6. The lower end of each dog extendsdownwardly and is normally disposed within one of the slots l ofthesleeve I3. Each dog has a hook I9 formed on its lower end, while itsupper end is provided with an upwardly extending arm or extension 2%],which is disposed adjacent to the tapered portion I a of the mandrelIt]. The arm of each dog is constantly urged radially outwardly from themandrel by a coiled spring 2 I, which is confined within a recess 22provided in the mandrel I8. It will be apparent that the lugs ll of thedogs I8 confine said dogs from longitudinal movement on said mandrel,said dogs being capable of a swinging movement as will be explained. Thecoiled springs 2I constantly urge the upper end of the dogs outwardly,to urge the lower ends of said dogs inwardly toward the center of thesleeve I3.

The upper portions of the dogs I8 are normally restrained againstoutward displacement from the mandrel due to the force of the springs2!, by means of a cylinder or tubular member 23, which cylindersurrounds the upper portion of the mandrel II]. The bore of'thecylinder. 23 is enlarged at its upper end, whereby an internal annularshoulder 24 is provided within said cylinder. The extreme lower end ofthe cylinder surrounds the arms of the dogs to limit the outwardmovement of the arms, and immediately above said arms the bore of thecylinder is formed with a tapered or inclined portion 25 for actuatingthe dogs, as will be hereinafter explained. The upstanding pin I I whichis formed on the upper end of the mandrel I0 is-slidably disposed withinthe enlarged upper end of the bore of the cylinder 23 and this pin has anut 26 threaded thereon, said nut being adapted to engage the internalshoulder 24 formed within said cylinder, as is clearly shown in Figure2.The cylinder is releasably connected to the mandrel by means of afrangible pin 2! which extends to a diametrically disposed opening 28formed in the mandrel and through radial openings 29 provided in thecylinder. For retaining the pin within the openings 28 and 29, the outerend of each opening 29 receives a plug 30 which is threaded into saidopening.

The upper end of the bore of the cylinder 23 is internallyscrew-threaded to receive a depending pin 3| which is formed on a sub orconnecting element 32. It is pointed out that when the pin 3| is withinthe cylinder, and the cylinder is connected to the mandrel by thefrangible pin 21, the lower end of the pin 3| is spaced from the upperend of the upstanding pin II on the mandrel. The upper end of the sub isconnected to a suitable raising and lowering mechanism, which mayconsist of stroke jars 33, of the usual construction, carried by aflexible line or cable C.

In theoperation of the device, the parts are assembled as shown inFigure2, with the cylinder 23 connected to the mandrel by means of thefrangible pin 21. In this position, the lower end of the cylindersurrounds the arms 2!! of the dogs and serves to restrain said dogs fromoutward displacement from the mandrel it. However, the diameter of thelower end of the bore of the cylinder is such that the springs 2i urgethe arms 20 outwardly a suiiicient distance to move the lower or hookends of the dogs inwardly within the slots M and into the bore of thesleeve I3 to maintain said dogs in their engaging position. The sleeveI3 and the lower portions of the dogs l8 may be passed downwardly overthe flange of a well device A which is to be run into the well tubing T.The flange 35 is moved upwardly between the dogs so that the undercutannular shoulder 38 formed by the underside of said flange is movedabove the hooks I9 of said dogs, whereby the well device A is suspendedfrom the tool. Any suitable Well device may be lowered by means of thetool herein described and the type shown includes a mandrel 31 having aslip assembly 38 slidably mounted thereon. The slip assembly includes aslip carrier 39 which is in the form of a sleeve slidable on the mandrel37. The flange 35 is formed integral with the upper end of the slipcarrier 39, whereby when the dogs I 8 are engaged with said flange andthe well device is suspended from the dogs, the slips are moved upwardlyon the tapered portion of the mandrel and are therefore in a retractedposition to permit lowering through the well tubing T. The coiledsprings 22 which constantly urge the upper ends of the dogs outwardlyassure that the lower or hook ends of said dogs remain in engagementwith the. flange to prevent accidental or unintentional disconnection.It is pointed out that when the hooks are engaged with the shoulder 36,the lower end of the sleeve I3 is spaced from an enlarged collar 49formed on the slip carrier 39.

It sometimes occurs during the lowering operation that the well device Amay encounter a tight or restricted space or portion within the tubing Twhich might temporarily arrest or impede the downward movement of thewell device. As the well device moves through this restricted space, theflexible line and upper portion of the jars 33 may continue movingdownwardly at a faster rate than the rest of the assembly. Whenthe welldevice passes through the tight space in the tubing, said device,together with the mandrel, cylinder and sub, may drop the full stroke ofthe jars 33 and such dropping might in some instances create sufficientforce to shear the pin 21. However, to prevent the shearing of the pin21, the shoulder 24 coacts with the nut 26 to take the thrust or loadunder this condition. Obviously, as the well device and mandrel tendtofall quickly, the nut 25 engages the shoulder 24 and carries thecylinder 23 with the mandrel, whereby the load is not imposed upon thepin 27. Therefore, the construction prevents the shearing of thefrangible pin 21 before the well device is set in its proper position.

It is apparent that if the well device were connected to the runningtool by means of rivets or shear pins, dropping of the well device, asabove described, might result in a breaking or shearing of said rivetsor pins, with the result that the well device would be disconnected fromthe running tool.

After lowering has been completed and the device A disposed in itsproper position, the slips 38 of said device are set by upward movementof the mandrel 3! relative to the slips. The setting of the slips may beaccomplished in any suitable manner but in the particular device shown,the line C is suddenly slacked to permit the running tool and slipassembly to move downwardly relative to the mandrel, whereby the slipsare expanded into engagement with the tubing. After the slips 38 of thedevice A are set to lock the device against upward movement within thetubing T, the cylinder 23, together with the mandrel I0, is moveddownwardly to the position shown in Figure 2, at which time the lowerend of the sleeve I3 engages the collar ill of the slip carrier. It isnoted that the sleeve is of suflicient length so that when its lower endengages the collar 49, the upper end of the tool does not contact thesolid bottom of the mandrel IE]. After the sleeve engages the collar 40,the jars 33 are then utilized to exert a downward force on the sub 32and cylinder 23 as well as on the mandrel I!) through the frangible pin27. A sufficient jarring downwardlyon the sub and cylinder will shearthe pin 21, since the mandrel It is held stationary by the engagement ofits sleeve i3 with the slip carrier. Any jarring is transmitted to theslip carrier to move the slips 38 into a tighter engagement with thewall of the well tubing T.

After the pin 2'! is sheared, the cylinder 23 moves downwardly to theposition shown in Figure 3, the lower end of said cylinder movingdownwardly relative to the arms 23 at the upper ends of the grippingdogs l3. As the cylinder moves downwardly over these arms, the inclinedor tapered portion 25 of the bore of the cylinder 23 moves intoengagement with the arms 2%] and forces the same inwardly toward themandrel against the force of the springs 22 (Fig. 3). Such inwardmovement of the arms causes the arms to move into engagement with thetapered portion Ilia of the mandrel, and the dogs fulcrum on the base ofsaid tapered portion, whereby the lower or hook-ends of said dogs aremoved radially outwardly through the slots 14 of the sleeve l3. Suchoutward movement of the lower ends of the dogs swings said dogsoutwardly beyond the shoulder 36 of the flange 35, whereby when thedevice is raised, said hooks will not engage said shoulder.

The jarring action imposed on the cylinder 23 may ordinarily besufiicient to move the tapered portion 25 of the sleeve 23 into africtional engagement with the upper ends of the arms 25, whereby thelower ends of the dogs may be held in an expanded position by thisfrictional engagement. However, to'assure that the dogs are maintainedin a non-engaging positionto permit upward removal of the assembly, the

mandrel It is provided with a spring-pressed plunger 53 which is mountedwithin an opening formed in the upper portion of said mandrelimmediately below the upstanding pin ll (Fig. 5). When the parts are inthe position shown in Figure 2 during the lowering operation, the outerend of the plunger 58 is engaging the wall of the bore of the cylinder23 below the internal shoulder 2 When the pin 2? is sheared and thecylinder 23 is moved downwardly with relation to the mandrel, theshoulder 2 is moved downwardly relative to the plunger 53, whereby saidplunger may move to the position shown in Figure 5, above the shoulder24. When the plunger extends over the shoulder, it will be manifest thatan upward movement of the sleeve or cylinder 23 will result in an upwardmovement of the mandrel H such movement being transmitted through theengagement of the shoulder with the plunger 56. Therefore, an upwardmovement of the cylinder 23 relative to the mandrel, after the dogs havebeen moved to a non-engaging position, is prevented and it is impossiblefor said dogs to move into their engaging position until such time asthe plunger 5!! is dis- 23 with respect to the mandrel until theextended plunger 50 moves into alinement with a vertical slot 52 whichis provided in the bore of the cylinder 23 and which extends downwardlyfrom the shoulder 24. When the plunger 50 is aliped with the verticalgroove or slot 52, the cylinder may then be moved upwardly relative tothe mandrel until the nut 26 engages the shoulder 24 and the openings 29in said cylinder are in horizontal alinement with the opening 28 in themandrel. It is noted that the disposition of the vertical groove orrecess 52 is such that when the pin or plunger 50 is engaged therein,the openings 29 in the cylinder are oifset radially from the opening 28in the mandrel. Therefore, in order to radially aline the openings 29and 28, it is necessary to impart a rotation to the cylinder 23 and suchrotation will cause the plunger 50 to ride out of the vertical groove orrecess 52. The movement of the plunger from the groove 52 upon rotationof the sleeve is facilitated by the incli'ned or bevelled side-walls 53of said groove. After the openings 28 and 29 are alined, the plugs 32are removed and the sheared pin 21 is replaced by a nev. pin. At thistime, the end of the plunger 5!! has been reengaged with the wall of thecylinder bore and the device is again ready for use.

It is noted that when it is desired to remove a device by means of thetool, the parts are lowered with the cylinder and mandrel in theposition shown in Figure 2. As the device moves into engagement withafiange at the upper endof the well device, said flange automaticallyexpands the lower ends of the dogs l8 to permit the dogs to pass overthe flange and engage the undercut shoulder therebeneath, such expansionbeing permitted by the coiled springs 22. After being engaged, an upwardpull on the cylinder 23 will be transmitted to the mandrel through theshoulder 24 and nut 26.

From the foregoing, it will be seen that a simple and efficient runningtool is provided. By employing the dogs 18 for positively engaging thedevice which is'being lowered, the necessity of riveting or frangiblyconnecting the running tool to the device being lowered is eliminated.The shear pin 27 which is employed in releasing the tool is mountedwholly within the body of said tool and is fully enclosed, whereby thepieces of the sheared pin cannot enter the bore of the Further, duringthe lowering operation,

the shoulder 24 so as to relieve the pin of suchload and prevent itsbeing sheared prior to the time the device is set. A positive latcharrange ment locks the dogs in their released position and assures thatthe running tool may be readily disengaged from the well device andremoved from the tubing after the Well device is-located in its properposition. The construction facilitates the replacement of the pin 2!after each run, whereby the tool may be quickly reset for the next use.Although the tool has been described in conjunction with a particulartype of well device, it is apparent that it may be employed for runningor removing many types of bottom hole well devices. The foregoingdescription of the invention is explanatory thereof and various changesin the size, shape-and'materials, as well as in the details of theillustrated construction may be made, within the scope of the appendedclaims, without departing from the spirit of the invention.

What I claim and desire to secure by Letters Patent is:

1. A well tool including, a support, movable;

elements mounted on said support adapted to engage a device to belowered or raised in a well bore and yieldably urged toward an engagingposition, and means on the support mounted to coact with the elements tomove said elements to a non-engaging position, said last named meansbeing actuated to disengage the elements from the device upon theapplication of a downward force on said support.

2. A well tool including, a support, movable elements mounted on saidsupport adapted to engage a device to be raised or lowered in a wellbore, and yieldably urged toward an engaging position, means on thesupport mounted to coact with the elements to move said elements to anon-engaging position, and means for positively holding the grippingelements in their non-engaging position.

3. A well tool including, a support adapted to be attached to a flexibleline and lowered within a well bore, movable elements mounted on thesupport adapted to engage a well device and yieldably urged toward anengaging position, a sleeve surrounding the upper ends of the movableelements and the support and adapted to coact with the elements to movesaid elements to a non-engaging position upon downward movement of thesleeve, and means for releasably connecting said sleeve in a raisedposition on the support.

4. A well tool including, a support adapted to be attached to a flexibleline and lowered within a well bore, movable elements mounted on thesupport adapted to engage a well device and yieldably urged toward anengaging position, a sleeve surrounding the support and detachablyconnected thereto, said sleeve being arranged to coact with the movableelements to move them to a non-engaging position, means fordisconnecting said sleeve from the support and for moving it downwardlyrelative to the movable elements to move said elements to a non-engagingposition, and means for latching the sleeve in its lowered positionholding the elements in a non-engaging position.

5. A well tool including, a support, dogs adapted to engage a welldevice to be lowered in a well bore and mounted on the support withtheir lower ends movable radially of said support, means for yieldablymaintaining the lower ends of the dogs inwardly in an engaging position,whereby said dogs may be engaged with the well device to suspend thesame therefrom, a tubular member surrounding the upper end of thesupport and detachably connected thereto, said member being movabledownwardly on the support when detached and arranged to coact with thedogs to move the same to a non-engaging position, and means forconnecting the tubular member with a raising and lowering mechanismwhereby the assembly may be lowered within a well bore.

6. A well tool including, a support, dogs adapted to engage a welldevice and mounted on the support with their lower ends movable radiallyof said support, means for yieldably maintaining the lower ends of thedogs inwardly in an engaging position, whereby said dogs may be engagedwith the well device to suspend the same therefrom, a tubular membersurrounding the upper end of the support and detachably connectedthereto, said member being movable downwardly on the support whendetached and arranged to coact with the dogs to move the same to anon-engaging position, means for connecting the tubular member with aflexible line whereby the assembly may be lowered within a well bore,and means for detaching the tubular member by a downward force there,-against to move the same downwardly to effect disengagement. of the dogsfrom the well device.

7. A well tool including, a support, dogs adapted to engage a welldevice and mounted on the support with their lower ends movable radiallyof said support, means for yieldably maintaining the lower ends of thedogs inwardly in an engaging position, whereby said dogs may be engagedwith the well device to suspend the same therefrom, a tubular membersurrounding the upper end of the support and detachably connectedthereto, said member being movable downwardly on the support whendetached and arranged to coact with the movable dogs to move the same toa non-engaging position, means for connecting the tubular member with aflexible line whereby the assembly may be lowered within a well bore,means for detaching the tubular member by a downward jar thereagainst tomove the same downwardly to effect disengagement of the dogs from thewell device, and coacting means on the support and tubular member forlatching the member in a position holding the dogs in their non-engagingposition.

8. A well tool including, a support, dogs adapted to engage a welldevice and mounted on the support with their lower ends movable radiallyof said support, means for yieldably maintaining the lower ends of thedogs inwardly in an engaging position, whereby said dogs may be engagedwith the well device to suspend the same therefrom, a tubular membersurroundin the upper end of the support and detachably connectedthereto, said member being movable downwardly on the support whendetached and arranged to coact with the movable dogs to move the same toa non-engaging position, means for connecting the tubular member with aflexible line whereby the assembly may be lowered within a well bore,means for detachin the tubular member by a downward force thereagainstto move the same downwardly to effect disengagement of the dogs from thewell device, and means for transmitting a further downward forcedirectly to the support and to the well device below said support afterthe tubular member is disconnected.

.9. A well tool including, a support, dogs adapted to engage a welldevice and mounted on the support with their lower ends movable radiallyof said support, means for yieldably maintaining the lower ends of thedogs inwardly in an engaging position, whereby said dogs may be engagedwith a well device to suspend the same therefrom, a tubular membersurrounding the upper end of the support and detachably connectedthereto, said member being movable downwardly on the support whendetached and arranged to coact with the movable dogs to move the same toa non-engaging position, means for connecting the tubular member with aflexible line whereby the assembly may be lowered and raised within awell bore, means for detaching the tubular member by a downward jarthereagainst to move the same downwardly to effect disengagement of thedogs from the well device, and a spring-pressed latch carried by thetubular member and coacting with the support for latching the member ina position maintaining the dogs in their non-engaging position.

10. A running tool for lowering a well device into a well boreincluding, a mandrel having 21 depending sleeve, said sleeve havingvertical slots therein, dogs adapted to engage a well device and mountedto swing on said mandrel and having their lower ends disposed within theslots of the sleeve, yieldable means for urging the lower ends of thedogs inwardly to an engaging position whereby said dogs may be engagedwith the well device, a tubular member slidable on the upper portion ofthe mandrel and adapted to coact with the dogs to move the dogsoutwardly when said member is moved downwardly, frangible means normallyconnecting the member and mandrel to maintain the member raised withrespect to the dogs, and a sub in the upper end of the tubular memberand spaced from the upper end of the mandrel when the tubular member isconnected with the mandrel, said sub moving downwardly into engagementwith the mandrel when the tubular member is slid downwardly, whereby adownward force on said sub is transmitted directly to the mandrel.

11. A running tool for lowering a well device into a well boreincluding, a inandrelhaving a depending sleeve, said sleeve havingvertical slots therein, dogs adapted to engage a well device and mountedto swing on said mandrel and having their lower ends disposed within theslots of the sleeve, yieldable means for urging the lower ends of thedogs inwardly to an engaging position whereby said dogs may be engagedwith the well device, a tubular member slidable on the upper portion ofthe mandrel and adapted to coact with the dogs to move the dogsoutwardly when said member is moved downwardly, a frangible pin normallyconnecting the member and mandrel to maintain the member raised withrespect to the dogs, coacting-means on the tubular member and mandrelfor latching the tubular member in a lowered position after thefrangible pin is sheared and the member is moved downwardly, whereby thedogs are latched in a non-engaging position, and a sub in the upper endof the tubular member and spaced from the upper end of the mandrel whenthe tubular member is connected with the mandrel, said sub movingdownwardly into engagement with the mandrel when the tubular member isslid downwardly, whereby a downward force on said sub is transmitteddirectly to the mandrel.

12. A well tool including, a support, dogs adapted to engage a welldevice and mounted on the support with their lower ends movable radiallyof said support, means for yieldably maintaining the lower ends of thedogs inwardly in an engaging position, whereby said dogs may be engagedwith the well device to suspend the same therefrom, a tubular membersurrounding the upper end of the support and detachably connectedthereto, said member being movable downwardly on the support whendetached and arranged to coact with the movable dogs to move the same toa non-engaging position, raising and lowering mechanism connected to thetubular member whereby the assembly may be lowered within a well bore,means for detaching the tubular member by a downward jar thereagainst tomove the same downwardly to effect disengagement of the dogs from thewell device, and coacting means on the support and tubular member forlatching the member in a position holding the dogs in their non-engagingposition.

L3. A well tool including, a support, dogs adapted to engage a welldevice and mounted on the support with their lower ends movable radiallyof said support, means for yieldably maintaining the lower ends of thedogs inwardly in an engaging position, whereby said dogs may be engagedwith a well device to suspend the same therefrom, a tubular membersurrounding the upper end of the support and detachably connectedthereto, said member being movable downwardly on the support whendetached and arranged to coact with the movable dogs to move the same toa non-engaging position, raising and lowering mechanism connected to thetubular member whereby the assembly may be lowered and raised within awell bore, means for de taching the tubular member by a downward jarthereagainst to move the same downwardly to effect disengagement of thedogs from the well device, and a spring-pressed latch carried by thetubular member and coacting with the support for latching the member ina position maintaining the dogs in their non-engaging position.

14. In a device of the character described, a body, a mandrel carried bythe body and arranged for limited longitudinal movement relativethereto, said mandrel extending below the body and forming a bowl, openat the bottom, adapted to be placed over a device in a well, meanscarried by the mandrel below the body for engaging said device, andnormally urged to engaging position, means operative upon relativemovement between the body and the mandrel to move the engaging means todisengaging position, and a releasable connection between the body andthe mandrel to prevent such relative movement.

15. In a device of the character described, a body member having a bore,a mandrel having a portion slidable in the bore, as well as a portionbelow the body forming a bowl, open at the bottom, adapted to be placedover a device in a well, means forming a lost motion connection betweenthe mandrel and the body, members carried by the mandrel below the bodyfor engaging said device, means urging said members to engagingposition, means adapted to retract the members from engaging position,said means being operative upon relative movement between the mandreland the body, and a releasable connection securing the mandrel in thebody.

16. In a device of the character described, a mandrel, means forming afrangible support for said mandrel, jaw members pivotally secured to themandrel, means urging the jaw members to active position, a membermovable with respect to the mandrel upon fracture of said support, saidmember being adapted to move the jaw members to inactive position, andmeans adapted to form a second support for the mandrel upon fracture ofthe frangible support.

1'7. In a running tool for well devices, the combination of an elongatesupport, a supporting element movably mounted on said support inposition for engaging over a projection on a well device to be loweredor raised in a well bore, said element being normally resilientlypositioned so as to yield outwardly and to automatically move inwardlyinto engaging position when moved onto such a well tool, means carriedby the support adjacent said element and extending below said elementfor engaging such a well device for supporting the tool in engagingposition thereon, and means on the support mounted to co-act with saidresiliently positioned element to positively move said element torelease it from a well tool, upon the application of a downward force onsaid support.

HERBERT C. OTIS.

